Experimental Design and Variables

This variable in an experiment is the one being deliberately changed by the scientist. 

• dependent variable

• independent variable

• data

• control group

This part of the experiment serves as a basis of comparison; the one variable being tested has been omitted. 

• experimental group

• control group

• data

• variables

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, the independent variable is ...

• The type of plant

• The amount of sunlight

• The type of music

• The type of liquid

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Identify the parts of the experiment -

• group that doesn't receive IV

• Control Group

• kept same throughout experiment

• Experimental Group

• group that receives the IV

• Dependent Variable

• factor that is deliberately changed

• Constants

• factor that changes in response to IV

• Independent Variable

Tags

NGSS.MS-PS2-2

Match the following experimental variables

• Variable that is measured or observed in an experiment

• Depenent variable

• Predicted explanation for a phenomenon

• Independent variable

• Variable that is manipulated in an experiment

• Control group

• Group in an experiment that receives the treatment

• Hypothesis

• Group in an experiment that does not receive the treatment

• Experimental group

Tags

NGSS.MS-PS2-2

A student did an experiment to test how effective different antibiotics are. She treated one paper disk with water, and three others with different antibiotics. Each was placed on a dish where bacteria could grow.

• Experimental Group

• The bacterial growth

• Constant Variable

• The type of antibiotic

• Control Group

• Disks with antibiotics

• Independent Variable

• The size of the paper disks

• Dependent

• The disk with water

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Pea plant clones are giving different amounts of water for a three-week period. The first pea plant receives 400 milliliters a day. The second pea plant receives 200 milliliters a day. The third pea plant receives 100 milliliters a day. The fourth pea plant does not receive any extra water; the plant only receives natural ways of receiving water. The heights of the pea plants are recorded daily. What are the variables and control group?

• Amount of water given

• Control Group

• Pea plant heights

• Independent Variable

• Fourth pea plant

• Dependent Variable

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

A study was done to determine to figure out if HOW LONG YOU SLEEP affects your TEST SCORE. The INDEPENDENT variable is...

• test scores

• place you sleep

• hours of sleep

What is the dependent variable for this investigation?

• Type of material (rocks, sand etc)

• Temperature after 10 minutes

• Time under the lamp

• Heat lamp, amount of material

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Match the following

• control group

• held the same for ALL groups in an experiment

• constants

• data recorded or observed

• Independent variable

• manipulated by the experimenter

• dependent variable

• "normal" conditions; used for comparison